Station instants computed with Swiss Ephemeris to the minute, in UTC. Mercury is retrograde about 3.3 times a year for 19–24 days.
Mercury is retrograde 3 times in 1903: from Jan 24, 1903, 15:15 UTC at 19°10′ Aquarius until Feb 14, 1903, 18:20 UTC at 3°29′ Aquarius; from May 22, 1903, 19:39 UTC at 16°05′ Gemini until Jun 15, 1903, 17:24 UTC at 7°32′ Gemini; from Sep 20, 1903, 22:21 UTC at 18°04′ Libra until Oct 12, 1903, 14:40 UTC at 2°54′ Libra.
| Stations retrograde | At | Stations direct | At | Days | Arc | Pre-shadow from | Post-shadow to |
|---|---|---|---|---|---|---|---|
| Jan 24, 1903, 15:15 UTC | 19°10′ Aquarius | Feb 14, 1903, 18:20 UTC | 3°29′ Aquarius | 21.13 | 15.67° | 3°29′ Aquarius | 19°10′ Aquarius |
| May 22, 1903, 19:39 UTC | 16°05′ Gemini | Jun 15, 1903, 17:24 UTC | 7°32′ Gemini | 23.91 | 8.55° | 7°32′ Gemini | 16°05′ Gemini |
| Sep 20, 1903, 22:21 UTC | 18°04′ Libra | Oct 12, 1903, 14:40 UTC | 2°54′ Libra | 21.68 | 15.17° | 2°54′ Libra | 18°04′ Libra |
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